i : The annual real interest rate which is related to the nominal interest rate i (the rate at which you could get a loan) and the annual inflation rate f.
Yproj : The component lifetime, year;
CRF : The capital recovery factor.
Crep(k) : The replacement cost of the component (H2 tank and fuel cell), US$;
Yrep,k : The component (H2 tank and fuel cell ) lifetime, year;
SFF : The sinking fund factor.